Power Supply - PSU Adapter 9V-1A UK With 5.5 X 2.1 Plug
This is a dedicated external PSU switching power supply adapter. It takes an AC 100-240V input, rectifies and filters it into DC, then converts it back into AC at a high switching frequency. The voltage is stepped down with a transformer, then rectified and filtered again into a stable DC 9V 1A output.